Piston ahd j



' a citizen of the. United States, resid FFll@Eo znn'n ncnnLBnnGnn'onGosnnN, INDIANA.

rrsron Ann encarna-nine.

ref-enero. l

l Specication'of Letters Patent.

Application ledepril 1'?, 1918. Serial No. 298,999.

To all whoin it mag/.'comem: n

Be itlmown thatgl, Zena EcKaL-nnnonn;

Goshen, county of Elkhart,

State of indiana, have invented certainnew and useful ImT 'provements in Pistons and Packing-Rings,

of which the following is a specification.

ing rings, and more especially to pistons and packing rin s for use in internal combustion engines, an to improvements in such devices. i 1 f y.

An object of my invention is'the production of a piston and packing ring, more especially the latter,` forinternal combustion engines which becomes very effective as 'a pack- -f stroke of the ending gases thereon. Another object' ist e production of a packing ring which' exertsY a.

ingi member on the workin relatively light pressure on the cylinder wall i during all-the piston movements except the ,n workingistroke thereof. Still' another ob-- ject of my invention is the production of a packing ring having means for effecting a sealon the piston head to preserve the comof means on a packing ring to ex pression-on the compression stroke and to prevent leakage past rthe ring and through` its groove Aduring the working stroke of the piston. Yet another object is the provision c ude carbon from the packing ring groove. Other objects are mentioned and described herein.

' numeral 1 indicatesan engine cylinder of the The preferred embodiment of my invention is well illustrated in the accompanying drawing in which the ligure disclosed is a' section 'taken through an engine cylinder, piston, and -my i improved packing ring mounted inthe piston. Similar numerals of reference indicate` like members and parts of t dinary spllt packing ring and, except when members thereon. `lileferring to the drawing in detail, the

conventional or any type having .a bore 2 within which the cylindrical iston 3 is4 arranged for vreciproca-tion. T e iston 3 is provided-with the head 4 and tlie annular endless packing ring groove' encircling the outer periphery of the piston body adjacent the top'end thereof, the upper wall whereof is formed by the annular shoulder or flange 6 which lies substantially vin the same plane withjthe piston head 4 the outer lor circumf ferential periphery of said flange being spaced 'substantially from the cylinder bore.

ing at.

particular art.` The ring 7 is provided with This invention relates to pistons and pack` an annular groove 9 on its inner periphery Within which groove the annular flange 6 is arranged with slight play. kThe lower wall of the ring groove 9 consists 'of an annular inwardly projecting lia-nge 10 which is arrangediwithinthe groove with slight play, the lbottom periphery of said ange being slightly spaced from the annular floor` 11, oi'

the piston body, which forms a. part of the groove 5v and an outward extension thereof.`

' The ring 'I is rovided 'and formed withl an annular upwar extension 12 which is projected above the upper periphery of the pis ton head il, said extension' being formed with a cylindrical exterior 13 which accurately conforms to the cylinder bore and slides thereon.4 The extensin 12 is provided also with la sloping or inclined inner wall lll exs tending from a relatively sharp edge at the top of the extension portion inwardly orv expand it, the ring engages the wall` of the cylinderjbore lightly, thereby causing the .resented oet; as, isn a minimum friction thereon which is 'substane tially less than that exerted by the ordinary packing ring.

In operation, the seat 16 seals against both leakage of compression and gas expansion past the ring interior and through the groove 9 thereof as well as eil'ectually preventing Jcarbon accumulation within said groove and` elsewhere elther on the ring surface or within the groove 5.

lll)

-v I claim.:

l. A piston comprising a cylindrical body portion having e head, said head having an annular circumferential Harige thereon and a is e sea on ie u r ieri) erf :sait iinhd t' tl ppe]L iliyoi l iange adjacent the outer edge thereof9 Said anfre eine of su s anla iianie er iibbbtbttllyllt than the piston body; and an annular one piece split expansible packing ring the inner periphery whereof is provided with an endless circumferential groove which is engaged sai is on iea ano'e' e u )er wa oA b d t l dfi l,tli lli .said groove being arranged upon said seat and finished to Correspond with the linisli thereof, said ring extending upward above Said head flange, the inner Wall of said ex*- tension being inclined downwardly and inwardly relative tothe outer edge tliereoand terminating adjacent tlie inner edge of the upper Wall of said ring` groove, said eXtension inclination being ada ted, when subljeeted to pressure from a ove, to expand said ring and to effect a seal between the uplar packing ring tlie inner periphery' whereof is provided with a groove which is engaged by the piston head flange the upper Wall of said groove being arranged upon said seat to effect :i seal, said ring extending upward above said iange the inner Wall of said ring exteneion being inclined relative to the outer wall thereof and terminating adjacent tlie inner edge of the upper Wall of said peeking ring groove.

In testimony whereof- I have hereunto aiijeg my signature this 9th day oi iff-.pril7 .enna ECKELBARGER. 

